<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Title</title>
</head>
<body>

</body>
<script>
	// if(1===1){
	// 	let a =1;
	// }
	// console.log(a);
	
	{
		let a =2;
		console.log(a);
	}
	let a = 3;
	let a = 4;
	console.log(a);
</script>
</html>